CN111447524A

CN111447524A - Multi-frequency-division independent processing noise reduction earphone and noise reduction method thereof

Info

Publication number: CN111447524A
Application number: CN202010321061.3A
Authority: CN
Inventors: 马浩; 周志伟
Original assignee: Dongguan Liesheng Electronic Co Ltd
Current assignee: Dongguan Liesheng Electronic Co Ltd
Priority date: 2020-04-22
Filing date: 2020-04-22
Publication date: 2020-07-24

Abstract

The invention discloses a multi-frequency-division independent processing noise reduction earphone and a noise reduction method thereof, wherein the multi-frequency-division independent processing noise reduction earphone comprises a rear shell, a middle cover and a front cover which are sequentially installed, at least two mutually isolated frequency division cavities are formed between the rear shell and the middle cover, a first microphone and a first low-pass filter which are used for low-frequency phase extraction are arranged in one frequency division cavity, and a third microphone and a high-pass filter which are used for high-frequency phase extraction are arranged in one frequency division cavity; a sound outlet cavity communicated with the frequency division cavity is formed between the front cover and the middle cover, and a fourth microphone and a third low-pass filter for filtering residues of the mixed signal are arranged in the sound outlet cavity; the rear side of the middle cover is also provided with a first loudspeaker and a third loudspeaker for outputting audio, and the rear ends of the first loudspeaker and the third loudspeaker are respectively arranged in a frequency division cavity; the first microphone, the first low-pass filter, the third microphone, the high-pass filter, the fourth microphone, the third low-pass filter, the first loudspeaker and the third loudspeaker are all connected with the controller.

Description

Multi-frequency-division independent processing noise reduction earphone and noise reduction method thereof

The technical field is as follows:

the invention relates to the technical field of earphone products, in particular to a multi-frequency-division independent processing noise reduction earphone and a noise reduction method thereof.

Background art:

the earphone is a pair of conversion units which receive the electric signals sent by the media player or receiver and convert the electric signals into audible sound waves by using a loudspeaker close to the ear. The earphone, as a listening device, has been widely used in various industries, and has the advantages of low price, compactness, convenient use and no interference to others. Common earphones are of a plurality of types, such as a head-wearing type earphone, an ear-hanging type earphone and an in-ear type earphone, and are various in variety and appearance.

The existing earphones are generally provided with a chamber mounting loudspeaker, a microphone is adopted to collect noise, and a low-pass filter or a high-pass filter is matched to filter the noise. When a low-pass filter is adopted, the amplitude-frequency characteristic is flat from 0 to f2, the part of the signal lower than f2 can be hardly attenuated and passed through by the low-pass filter, the IIR algorithm filter can effectively extract and reversely process the part for offsetting noise, the part of the signal higher than f2 is greatly attenuated, and the IIR algorithm filter cannot extract and reversely process the residual noise. When a high-pass filter is used, the amplitude-frequency characteristic is flat from the frequency f1 to the frequency ∞, as opposed to a low-pass filter. It allows the frequency components above f1 in the signal to pass unattenuated, while the frequency components below f1 will be extremely attenuated, and the algorithmic filter will not extract the noise source for the reverse cancellation process.

That is to say, present earphone can only handle high frequency noise or low frequency noise, when filtering high frequency noise, can remain low frequency noise, and when filtering low frequency noise, then can remain high frequency noise, can't get rid of simultaneously promptly and filter high frequency noise and low frequency noise to the clean music signal of output influences tone quality, is unfavorable for improving market competition.

In view of the above, the present inventors propose the following.

The invention content is as follows:

the invention aims to overcome the defects of the prior art and provides a multi-frequency-division independent processing noise reduction earphone and a noise reduction method thereof.

In order to solve the technical problem, the invention adopts the following first technical scheme: the multi-frequency-division independent processing noise-reduction earphone comprises a rear shell, a middle cover arranged at the front end of the rear shell and a front cover arranged at the front end of the middle cover, wherein at least two mutually isolated frequency division cavities are formed between the rear shell and the middle cover, a first microphone and a first low-pass filter for low-frequency phase extraction are arranged in one frequency division cavity, and a third microphone and a high-pass filter for high-frequency phase extraction are arranged in one frequency division cavity; a sound outlet cavity communicated with the frequency division cavity is formed between the front cover and the middle cover, and a fourth microphone and a third low-pass filter for filtering residues of mixed signals are arranged in the sound outlet cavity; the rear side of the middle cover is also provided with a first loudspeaker and a third loudspeaker for outputting audio, and the rear ends of the first loudspeaker and the third loudspeaker are respectively arranged in a frequency division cavity; the first microphone, the first low-pass filter, the third microphone, the high-pass filter, the fourth microphone, the third low-pass filter, the first loudspeaker and the third loudspeaker are all connected with the controller.

Further, in the above technical solution, the number of the frequency division cavities is three, and the frequency division cavities are respectively a bass cavity, a midrange cavity and a treble cavity, and the first microphone and the first low-pass filter are disposed in the bass cavity; a second microphone and a second low-pass filter for extracting an intermediate frequency phase are arranged in the middle sound cavity, and a third microphone and a high-pass filter are arranged in the high sound cavity; a second loudspeaker for outputting audio is arranged on the rear side of the middle cover, and a middle sound cavity of the second loudspeaker is arranged in the middle sound cavity; the rear ends of the first loudspeaker and the third loudspeaker are respectively arranged in the bass cavity and the treble cavity; and the second microphone, the second low-pass filter and the second loudspeaker are all connected with the controller.

Furthermore, in the above technical solution, the periphery of the rear shell is provided with a first perforation, a second perforation and a third perforation respectively communicating the bass cavity, the middle-pitched cavity and the treble cavity, and the first perforation, the second perforation and the third perforation are respectively provided with a first tuning net, a second tuning net and a third tuning net therein.

Further, in the above technical solution, the middle-pitched cavity and the high-pitched cavity have the same size, and are both smaller than the size of the low-pitched cavity.

Furthermore, in the above technical scheme, the rear shell is formed with a bass groove, a middle-tone groove and a treble groove which are isolated from each other, the bass groove, the middle-tone groove and the treble groove are respectively formed after being butted with the middle cover, the bass cavity, the middle-tone cavity and the treble cavity are formed, the bottoms of the bass groove, the middle-tone groove and the treble groove are respectively formed with a first clamping groove, a second clamping groove and a third clamping groove, and the first microphone, the second microphone and the third microphone are respectively fixed in the first clamping groove, the second clamping groove and the third clamping groove in a clamping and embedding manner.

Further, among the above-mentioned technical scheme, well lid rear side still is provided with first mounting groove, second mounting groove, the third mounting groove that isolates each other, and this well lid front end is seted up three groups backward and is link up respectively first through-hole, second through-hole, the third through-hole of first mounting groove, second mounting groove, third mounting groove, first loudspeaker, second loudspeaker and third loudspeaker set up respectively in this first mounting groove, second mounting groove, third mounting groove.

Furthermore, in the above technical solution, the front cover is provided with a plurality of sound outlet holes corresponding to the sound outlet chamber, and a mounting ring is disposed at a rear side of the front cover, and the fourth microphone is mounted in the mounting ring in a snap-fit manner.

Further, in the above technical solution, the controller includes a DSP chip, and a DPS module, a power management module connected to the DPS module, a register for connecting to music input, an AGC module for adjusting a gain of the microphone, and a plurality of operational amplifiers are integrated in the DSP chip; the first low-pass filter, the second low-pass filter, the high-pass filter, the third low-pass filter, the first loudspeaker, the second loudspeaker and the third loudspeaker are respectively connected with an operational amplifier and then connected with the DPS module, and the first microphone, the second microphone, the third microphone and the fourth microphone are connected with a comparator and then connected with the DPS module; and reserved ports for controlling the on-off operation of the DSP chip and for communication of other chips are integrated in the DSP chip.

In order to solve the above technical problem, the present invention adopts the following second technical solution: the noise reduction method of the multi-frequency-division independent processing noise reduction earphone comprises the following steps that at least two frequency division cavities which are mutually isolated and a sound outlet cavity communicated with the frequency division cavities are arranged in the earphone, wherein a first microphone and a first low-pass filter are arranged in the first frequency division cavity and are used for collecting noise sources and filtering high-frequency noise, and high-frequency phase signals are sent to a DSP chip; a third microphone and a high-pass filter are arranged in the second frequency division cavity and used for collecting noise sources and filtering low-frequency noise, and low-frequency phase signals are sent to the DSP chip; the DSP chip mixes the high-frequency phase signal and the low-frequency phase signal after performing phase superposition on the high-frequency phase signal and the low-frequency phase signal, filters residual noise in the mixed signal through a fourth microphone and a third low-pass filter in the sound outlet chamber, and finally outputs a clean music signal through a loudspeaker.

Furthermore, in the above technical solution, the number of the frequency division cavities is three, wherein the third frequency division cavity is provided with a second microphone and a second low-pass filter for collecting noise sources and filtering high-frequency noise and low-frequency noise to extract a medium-frequency phase, and the medium-frequency phase is sent to the DSP chip, and the DSP chip performs phase superposition on the sent high-frequency, medium-frequency, and low-frequency phase signals and mixes the signals with music signals.

After adopting the technical scheme, compared with the prior art, the invention has the following beneficial effects: the invention overcomes the defects of the prior art that the low-pass filter or the high-pass filter is used independently, applies the acoustic architecture design of independent frequency division, and uses the algorithm extraction integration to realize the hybrid filter, thereby avoiding the interference between the upper frequency bands of the algorithm extraction, ensuring the output of clean music signals and ensuring the strong market competitiveness of the invention.

Description of the drawings:

FIG. 1 is a perspective view of the present invention;

FIG. 2 is a perspective view of another aspect of the present invention;

FIG. 3 is an exploded perspective view of the present invention;

FIG. 4 is a cross-sectional view of the present invention;

FIG. 5 is a cross-sectional view from another perspective of the present invention;

FIG. 6 is an internal structural view of the present invention;

FIG. 7 is a perspective view of the rear housing of the present invention;

FIG. 8 is a perspective view of the middle cap of the present invention;

FIG. 9 is a perspective view of the front housing of the present invention;

FIG. 10 is a circuit diagram of the present invention;

fig. 11 is a circuit schematic of the present invention.

The specific implementation mode is as follows:

the invention is further illustrated below with reference to specific embodiments and the accompanying drawings.

As shown in fig. 1-11, the multi-frequency division independent processing noise reduction earphone comprises a rear shell 1, a middle cover 2 arranged at the front end of the rear shell 1, and a front cover 3 arranged at the front end of the middle cover 2, wherein at least two mutually isolated frequency division cavities are formed between the rear shell 1 and the middle cover 2, so as to realize an acoustic architecture design of independent frequency division, wherein a first microphone 41 and a first low-pass filter 42 for low-frequency phase extraction are arranged in one frequency division cavity, and a third microphone 45 and a high-pass filter 46 for high-frequency phase extraction are arranged in one frequency division cavity; a sound outlet chamber 30 communicated with the frequency dividing chamber is formed between the front cover 3 and the middle cover 2, and a fourth microphone 301 and a third low-pass filter 302 for filtering the mixed signal residue are arranged in the sound outlet chamber 30; the rear side of the middle cover 2 is also provided with a first loudspeaker 51 and a third loudspeaker 53 for outputting audio, and the rear ends of the first loudspeaker 51 and the third loudspeaker 53 are respectively arranged in a frequency dividing cavity; the first microphone 41, the first low-pass filter 42, the third microphone 45, the high-pass filter 46, the fourth microphone 301, the third low-pass filter 302, the first loudspeaker 51 and the third loudspeaker 53 are all connected with a controller. The invention is provided with at least two frequency division cavities which are mutually isolated and a sound outlet cavity communicated with the frequency division cavities in an earphone, wherein a first microphone and a first low-pass filter are arranged in a first frequency division cavity and are used for collecting a noise source and filtering high-frequency noise, and a high-frequency phase signal is sent to a DSP chip; a third microphone and a high-pass filter are arranged in the second frequency division cavity and used for collecting noise sources and filtering low-frequency noise, and low-frequency phase signals are sent to the DSP chip; the DSP chip mixes the high-frequency phase signal and the low-frequency phase signal after performing phase superposition on the high-frequency phase signal and the low-frequency phase signal, filters residual noise in the mixed signal through a fourth microphone and a third low-pass filter in the sound outlet chamber, and finally outputs a clean music signal through a loudspeaker. That is, the invention combines the low-pass filter and the high-pass filter, uses the low-frequency and high-frequency independent units of two-frequency division (or multiple frequency division) as frequency division in combination with the acoustic mechanism (namely, the frequency division cavity), the low-pass filter takes the low-frequency unit as the low-frequency noise extraction and the reverse cancellation processing, the high-pass filter takes the high-frequency unit as the residual noise extraction and the reverse cancellation processing to realize the function of the mixed filter, and the DSP chip is adopted to mix the high-frequency and low-frequency phase signals with the music signals after the phase superposition, the low-pass filter filters the residual noise in the mixed signals, and finally the clean music signals are output through the loudspeaker. The invention overcomes the defects of the prior art that the low-pass filter or the high-pass filter is used independently, applies the acoustic architecture design of independent frequency division, and uses the algorithm extraction integration to realize the hybrid filter, thereby avoiding the interference between the upper frequency bands of the algorithm extraction, ensuring the output of clean music signals and ensuring the strong market competitiveness of the invention.

The number of the frequency dividing cavities is three, the frequency dividing cavities are respectively a bass cavity 101, a middle-tone cavity 102 and a treble cavity 103, and the first microphone 41 and the first low-pass filter 42 are arranged in the bass cavity 101; a second microphone 43 and a second low-pass filter 44 for extracting a middle-frequency phase are arranged in the middle-tone cavity 102, and a third microphone 45 and a high-pass filter 46 are arranged in the high-tone cavity 103; a second loudspeaker 52 for outputting audio is arranged at the rear side of the middle cover 2, and a middle sound cavity 102 of the second loudspeaker 52 is arranged; the rear ends of the first loudspeaker 51 and the third loudspeaker 53 are respectively arranged in the bass cavity 101 and the treble cavity 103; the second microphone 43, the second low-pass filter 44 and the second speaker 52 are all connected to the controller. The invention adds the second microphone 43 and the second low-pass filter 44, the second microphone 43 and the second low-pass filter 44 are used for extracting the intermediate frequency phase, filtering high and low frequency noise, and reserving the intermediate frequency signal, so that the phase superposition is carried out on the high, intermediate and low frequency phase signals through the DSP chip in the later period, and the noise filtering quality is ensured.

The periphery of the rear shell 1 is provided with a first perforation 11, a second perforation 12 and a third perforation 13 which are respectively communicated with the bass cavity 101, the middle-pitch cavity 102 and the treble cavity 103, a first tuning net 111, a second tuning net 112 and a third tuning net 113 are respectively arranged in the first perforation 11, the second perforation 12 and the third perforation 13, and the frequencies of the bass cavity 101, the middle-pitch cavity 102 and the treble cavity 103 are independently adjusted through the first tuning net 111, the second tuning net 112 and the third tuning net 113.

The middle-tone cavity 102 and the high-tone cavity 103 have the same size and are smaller than the low-tone cavity 101, so that the frequency division processing of low frequency, medium frequency and high frequency can be better realized.

The rear shell 1 is formed with a low-pitch groove 14, a middle-pitch groove 15 and a high-pitch groove 16 which are isolated from each other, the low-pitch groove 14, the middle-pitch groove 15 and the high-pitch groove 16 are respectively butted with the middle cover 2 to form a low-pitch cavity 101, a middle-pitch cavity 102 and a high-pitch cavity 103, the bottoms of the low-pitch groove 14, the middle-pitch groove 15 and the high-pitch groove 16 are respectively formed with a first clamping groove 141, a second clamping groove 151 and a third clamping groove 161, and the first microphone 41, the second microphone 43 and the third microphone 45 are respectively clamped and fixed in the first clamping groove 141, the second clamping groove 151 and the third clamping groove 161, so that the assembling stability of the first microphone 41, the second microphone 43 and the third microphone 45 is ensured, and the quality of frequency division design is ensured. Further, the rear side of the middle cover 2 is further provided with a first mounting groove 21, a second mounting groove 22 and a third mounting groove 23 which are isolated from each other, three sets of a first through hole 24, a second through hole 25 and a third through hole 26 which respectively penetrate through the first mounting groove 21, the second mounting groove 22 and the third mounting groove 23 are formed in the front end of the middle cover 2 in a backward direction, and the first loudspeaker 51, the second loudspeaker 52 and the third loudspeaker 53 are respectively arranged in the first mounting groove 21, the second mounting groove 22 and the third mounting groove 23, so that the assembly stability of the first loudspeaker 51, the second loudspeaker 52 and the third loudspeaker 53 is ensured.

The front cover 3 is provided with a plurality of sound outlet holes 31 corresponding to the sound outlet chamber 30, a mounting ring 32 is provided on the rear side of the front cover 3, and the fourth microphone 301 is mounted in the mounting ring 32 in a snap fit manner.

The controller comprises a DSP chip 6, wherein a DPS module 61, a power management module 62 connected with the DPS module 61, a register 63 used for connecting music input, an AGC module 64 used for adjusting microphone gain and a plurality of operational amplifiers 65 are integrated in the DSP chip 6; the first low-pass filter 42, the second low-pass filter 44, the high-pass filter 46, the third low-pass filter 302, the first loudspeaker 51, the second loudspeaker 52 and the third loudspeaker 53 are respectively connected with an operational amplifier 65 and then connected with the DPS module 61, and the first microphone 41, the second microphone 43, the third microphone 45 and the fourth microphone 301 are connected with a comparator and then connected with the DPS module 61; a reserved port 66 for controlling the on and off operation of the DSP chip 6 and for communication with other chips is integrated in the DSP chip.

In summary, the earphone is provided with at least two frequency dividing cavities which are isolated from each other and a sound outlet cavity communicated with the frequency dividing cavities, wherein a first microphone and a first low-pass filter are arranged in the first frequency dividing cavity and used for collecting a noise source and filtering high-frequency noise, and sending a high-frequency phase signal to the DSP chip; a third microphone and a high-pass filter are arranged in the second frequency division cavity and used for collecting noise sources and filtering low-frequency noise, and low-frequency phase signals are sent to the DSP chip; the DSP chip mixes the high-frequency phase signal and the low-frequency phase signal after performing phase superposition on the high-frequency phase signal and the low-frequency phase signal, filters residual noise in the mixed signal through a fourth microphone and a third low-pass filter in the sound outlet chamber, and finally outputs a clean music signal through a loudspeaker. That is, the invention combines the low-pass filter and the high-pass filter, uses the low-frequency and high-frequency independent units of two-frequency division (or multiple frequency division) as frequency division in combination with the acoustic mechanism (namely, the frequency division cavity), the low-pass filter takes the low-frequency unit as the low-frequency noise extraction and the reverse cancellation processing, the high-pass filter takes the high-frequency unit as the residual noise extraction and the reverse cancellation processing to realize the function of the mixed filter, and the DSP chip is adopted to mix the high-frequency and low-frequency phase signals with the music signals after the phase superposition, the low-pass filter filters the residual noise in the mixed signals, and finally the clean music signals are output through the loudspeaker. The invention overcomes the defects of the prior art that the low-pass filter or the high-pass filter is used independently, applies the acoustic architecture design of independent frequency division, and uses the algorithm extraction integration to realize the hybrid filter, thereby avoiding the interference between the upper frequency bands of the algorithm extraction, ensuring the output of clean music signals and ensuring the strong market competitiveness of the invention.

The invention also provides a noise reduction method of the noise reduction earphone with multi-frequency division independent processing, which comprises the steps that at least two frequency division cavities which are mutually isolated and a sound outlet cavity communicated with the frequency division cavities are arranged in the earphone, wherein a first microphone 41 and a first low-pass filter 42 are arranged in the first frequency division cavity and are used for collecting noise sources and filtering high-frequency noise, and high-frequency phase signals are sent to a DSP chip; a third microphone 45 and a high-pass filter 46 are arranged in the second frequency division cavity and used for collecting noise sources and filtering low-frequency noise, and low-frequency phase signals are sent to the DSP chip; the DSP chip mixes the high-frequency phase signal and the low-frequency phase signal after performing phase superposition on the high-frequency phase signal and the low-frequency phase signal, filters residual noise in the mixed signal through a fourth microphone 301 and a third low-pass filter 302 in the sound outlet chamber, and finally outputs a clean music signal through a loudspeaker. The invention overcomes the defects of the prior art that the low-pass filter or the high-pass filter is used independently, applies the acoustic architecture design of independent frequency division, and uses the algorithm extraction integration to realize the hybrid filter, thereby avoiding the interference between the upper frequency bands of the algorithm extraction, ensuring the output of clean music signals and ensuring the strong market competitiveness of the invention.

The number of the frequency division cavities is three, the third frequency division cavity is provided with a second microphone 43 and a second low-pass filter 44 which are used for collecting noise sources and filtering high-frequency noise and low-frequency noise so as to extract intermediate-frequency phases and send the intermediate-frequency phases to the DSP chip, and the DSP chip performs phase superposition on the sent high-frequency, intermediate-frequency and low-frequency phase signals and then mixes the signals with music signals. The noise reduction method of the multi-frequency-division independent processing noise reduction earphone is also additionally provided with a second microphone 43 and a second low-pass filter 44 which are used for collecting noise sources and filtering high-frequency noise and low-frequency noise so as to extract a medium-frequency phase, so that phase superposition is carried out on high-frequency phase signals, medium-frequency phase signals and low-frequency phase signals through a DSP chip at a later stage, and the noise filtering quality is further ensured.

It should be understood that the above description is only exemplary of the present invention, and is not intended to limit the scope of the present invention, which is defined by the appended claims.

Claims

1. The utility model provides a many frequency division independent processing noise reduction earphone which characterized in that: the high-frequency phase extraction device comprises a rear shell (1), a middle cover (2) arranged at the front end of the rear shell (1) and a front cover (3) arranged at the front end of the middle cover (2), wherein at least two mutually isolated frequency division cavities are formed between the rear shell (1) and the middle cover (2), a first microphone (41) and a first low-pass filter (42) for low-frequency phase extraction are arranged in one frequency division cavity, and a third microphone (45) and a high-pass filter (46) for high-frequency phase extraction are arranged in one frequency division cavity; a sound outlet chamber (30) communicated with the frequency division cavity is formed between the front cover (3) and the middle cover (2), and a fourth microphone (301) and a third low-pass filter (302) for filtering the mixed signal and remaining are arranged in the sound outlet chamber (30); a first loudspeaker (51) and a third loudspeaker (53) for outputting audio are further arranged on the rear side of the middle cover (2), and the rear ends of the first loudspeaker (51) and the third loudspeaker (53) are respectively arranged in a frequency division cavity; the first microphone (41), the first low-pass filter (42), the third microphone (45), the high-pass filter (46), the fourth microphone (301), the third low-pass filter (302), the first loudspeaker (51) and the third loudspeaker (53) are all connected with a controller.

2. The multi-division independent processing noise reduction headphone of claim 1, wherein: the number of the frequency division cavities is three, the frequency division cavities are respectively a bass cavity (101), a middle-tone cavity (102) and a treble cavity (103), and the first microphone (41) and the first low-pass filter (42) are arranged in the bass cavity (101); a second microphone (43) and a second low-pass filter (44) for extracting a medium-frequency phase are arranged in the middle-tone cavity (102), and a third microphone (45) and a high-pass filter (46) are arranged in the high-tone cavity (103); a second loudspeaker (52) for outputting audio is arranged on the rear side of the middle cover (2), and a middle sound cavity (102) of the second loudspeaker (52) is provided; the rear ends of the first loudspeaker (51) and the third loudspeaker (53) are respectively arranged in the bass cavity (101) and the treble cavity (103); the second microphone (43), the second low-pass filter (44) and the second loudspeaker (52) are connected with a controller.

3. The multi-division independent processing noise reduction headphone of claim 2, wherein: the periphery of the rear shell (1) is provided with a first perforation (11), a second perforation (12) and a third perforation (13) which are respectively communicated with the bass cavity (101), the middle-pitch cavity (102) and the treble cavity (103), and a first tuning net (111), a second tuning net (112) and a third tuning net (113) are respectively arranged in the first perforation (11), the second perforation (12) and the third perforation (13).

4. The multi-division independent processing noise reduction headphone of claim 2, wherein: the middle-tone cavity (102) and the high-tone cavity (103) are the same in size and smaller than the low-tone cavity (101).

5. The multi-division independent processing noise reduction headphone of claim 2, wherein: rear shell (1) shaping has low sound groove (14), well sound groove (15) and high sound groove (16) of mutual isolation, forms after this low sound groove (14), well sound groove (15) and high sound groove (16) dock with well lid (2) respectively bass cavity (101), well sound cavity (102) and high sound cavity (103), and the bottom of this low sound groove (14), well sound groove (15) and high sound groove (16) shaping respectively has first draw-in groove (141), second draw-in groove (151), third draw-in groove (161), first microphone (41), second microphone (43) and third microphone (45) inlay card are fixed in this first draw-in groove (141), second draw-in groove (151), third draw-in groove (161) respectively.

6. The multi-division independent processing noise reduction headphone of claim 2, wherein: well lid (2) rear side still is provided with first mounting groove (21), second mounting groove (22), third mounting groove (23) that mutually insulate, and this well lid (2) front end has seted up three groups backward and has link up respectively first through-hole (24), second through-hole (25), third through-hole (26) of first mounting groove (21), second mounting groove (22), third mounting groove (23), first loudspeaker (51), second loudspeaker (52) and third loudspeaker (53) set up respectively in this first mounting groove (21), second mounting groove (22), third mounting groove (23).

7. A multi-division independent processing noise reducing headphone according to any one of claims 2-5, characterized in that: the front cover (3) is provided with a plurality of sound outlet holes (31) of the sound outlet chamber (30), the rear side of the front cover (3) is provided with a mounting ring (32), and the fourth microphone (301) is installed in the mounting ring (32) in a clamping and embedding manner.

8. The multi-division independent processing noise reduction headphone of claim 6, wherein: the controller comprises a DSP chip (6), wherein a DPS module (61) and a power management module (62) connected with the DPS module (61), a register (63) used for connecting music input, an AGC module (64) used for adjusting microphone gain and a plurality of operational amplifiers (65) are integrated in the DSP chip (6); the first low-pass filter (42), the second low-pass filter (44), the high-pass filter (46), the third low-pass filter (302), the first loudspeaker (51), the second loudspeaker (52) and the third loudspeaker (53) are respectively connected with an operational amplifier (65) and then connected with the DPS module (61), and the first microphone (41), the second microphone (43), the third microphone (45) and the fourth microphone (301) are connected with a comparator and then connected with the DPS module (61); and a reserved port (66) for controlling the on and off operation of the DSP chip (6) and for communication of other chips is integrated in the DSP chip.

9. A noise reduction method of a noise reduction earphone with multiple frequency division independent processing is characterized in that: the noise reduction method comprises the steps that at least two frequency division cavities which are isolated in an exchange mode and a sound outlet cavity communicated with the frequency division cavities are arranged in an earphone, wherein a first microphone (41) and a first low-pass filter (42) are arranged in the first frequency division cavity and used for collecting a noise source and filtering high-frequency noise, and high-frequency phase signals are sent to a DSP chip; a third microphone (45) and a high-pass filter (46) are arranged in the second frequency division cavity and used for collecting noise sources and filtering low-frequency noise, and low-frequency phase signals are sent to the DSP chip; the DSP chip carries out phase superposition on the sent high-frequency phase signal and the sent low-frequency phase signal, then the high-frequency phase signal and the sent low-frequency phase signal are mixed with the music signal, residual noise in the mixed signal is filtered through a fourth microphone (301) and a third low-pass filter (302) in the sound outlet chamber, and finally the clean music signal is output through a loudspeaker.

10. The multi-division independent processing noise reduction headphone of claim 9, wherein: the number of the frequency division cavities is three, wherein the third frequency division cavity is provided with a second microphone (43) and a second low-pass filter (44) which are used for collecting noise sources and filtering high-frequency noise and low-frequency noise so as to extract intermediate-frequency phases and send the intermediate-frequency phases to the DSP chip, and the DSP chip performs phase superposition on the sent high-frequency, intermediate-frequency and low-frequency phase signals and then mixes the signals with music signals.